Arrays Questions

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81.

How do you initialize an array in C?

A

int arr[3] = (1,2,3);

B

int arr(3) = {1,2,3};

C

int arr[3] = {1,2,3};

D

int arr(3) = (1,2,3);

Correct Answer: C

None.

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82.

How do you instantiate an array in Java?

A

int arr[] = new int(3);

B

int arr[];

C

int arr[] = new int[3];

D

int arr() = new int(3);

Correct Answer: C

None.

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83.

Which of the following is a correct way to declare a multidimensional array in Java?

A

int[][] arr;

B

int arr[][];

C

int []arr[];

D

All of the mentioned

Correct Answer: D

None.

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84.

What is the output of the following piece of code?

public class array
{
 public static void main(String args[])
 {
  int []arr = {1,2,3,4,5};
  System.out.println(arr[2]);
  System.out.println(arr[4]);
 }
}

A

3 and 5

B

5 and 3

C

2 and 4

D

4 and 2

Correct Answer: A

None.

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85.

What is the output of the following piece of code?

public class array
{
 public static void main(String args[])
 {
  int []arr = {1,2,3,4,5};
  System.out.println(arr[5]);
 }
}

A

4

B

5

C

ArrayIndexOutOfBoundsException

D

InavlidInputException

Correct Answer: C

None.

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86.

When does the ArrayIndexOutOfBoundsException occur?

A

Compile-time

B

Run-time

C

Not an error

D

None of the mentioned

Correct Answer: B

None.

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87.

Which of the following concepts make extensive use of arrays?

A

Binary trees

B

Scheduling of processes

C

Caching

D

Spatial locality

Correct Answer: D

None.

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88.

What are the advantages of arrays?

A

Easier to store elements of same data type

B

Used to implement other data structures like stack and queue

C

Convenient way to represent matrices as a 2D array

D

All of the mentioned

Correct Answer: D

None.

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89.

What are the disadvantages of arrays?

A

We must know before hand how many elements will be there in the array

B

There are chances of wastage of memory space if elements inserted in an array are lesser than than the allocated size

C

Insertion and deletion becomes tedious

D

All of the mentioned

Correct Answer: D

None.

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90.

What is a bit array?

A

Data structure for representing arrays of records

B

Data structure that compactly stores bits

C

An array in which most of the elements have the same value

D

None of the mentioned

Correct Answer: B

None.

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